Mythbusters Sink Titanic Logic: Jack Didn't Have To Die?!

I've watched Leonardo DiCaprio die a dozen times as Jack Dawson in Titanic, each time cursing that Rose (Kate Winslet) for not sharing the Floating Debris of Life with her doomed lover. With every frail tweet of that rescue whistle, every whispered "Come baaaack!" I've wondered: Did Jack really have to die?
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